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地质学报  2004 

长江上源布曲盆地晚更新世湖相沉积的发现及其古植被与古气候

, PP. 527-533

Keywords: 长江上源布曲盆地,晚更新世,湖相沉积,U系年龄,古植被,古气候

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Abstract:

在青海省西南部青藏公路东南侧的通天河支流――布曲北岸(33°44′45.2″N,92°11′28.1″E),发现一条拔河0~18m的湖相沉积剖面。湖相沉积物的U系测年结果为88.9~56.2ka,确定其沉积时代为晚更新世早中期。结合孢粉分析结果,本文探讨了青海省西部地区通天河及布曲流域晚更新世早中期的古植被与古气候。初步研究表明,在该剖面的下部和上部沉积期间,当地生长松、桦、冷杉等乔木和蒿等草本植物,气候比较温暖湿润。剖面中部沉积期间,蒿、藜、禾本科和麻黄等草原植被明显增多,气候凉爽干燥。剖面沉积期间气候曾经历过温暖湿润和凉爽干燥的波动。植被与气候的变化具有从末次间冰期晚期经末次冰期早冰段到末次冰期间冰段中期的特征

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